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Debt - Narrative (Details)
$ in Millions
1 Months Ended 6 Months Ended
May 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
transaction
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Mar. 08, 2022
USD ($)
Feb. 28, 2022
USD ($)
Jan. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]                
Debt instrument, repurchased face amount   $ 2,716            
Debt repurchase, incurred debt premium   333            
Gain (loss) on repurchase of debt instrument   $ 155            
Repayments of debt     $ 5,829 $ 44        
Number of debt exchange transactions | transaction   2            
Debt instrument, exchange amount   $ 2,544            
Debt exchange, incurred premium   883            
Debt premium cash component   872            
Expense from exchange of debt   28            
Commercial paper program, amount outstanding     $ 320          
Notes Payable to Banks | 4.95% Notes due 2026                
Debt Instrument [Line Items]                
Debt instrument, repurchased face amount $ 1,250              
Stated interest rate 4.95%   4.95%          
Debt repurchase, incurred debt premium $ 79              
Gain (loss) on repurchase of debt instrument (83)              
Notes Payable to Banks | 3.75% Notes due 2027                
Debt Instrument [Line Items]                
Debt instrument, repurchased face amount   804            
Stated interest rate     3.75%          
Debt at face value           $ 1,000    
Notes Payable to Banks | 4.3% Notes due 2028                
Debt Instrument [Line Items]                
Debt instrument, repurchased face amount   777            
Stated interest rate     4.30%          
Debt at face value           1,000    
Notes Payable to Banks | 2.4% Notes due 2031                
Debt Instrument [Line Items]                
Debt instrument, repurchased face amount   273            
Stated interest rate     2.40%          
Debt at face value           500    
Notes Payable to Banks | 4.875% Notes due 2047                
Debt Instrument [Line Items]                
Debt instrument, repurchased face amount   481            
Stated interest rate     4.875%          
Debt at face value           800    
Notes Payable to Banks | 4.85% Notes due 2048                
Debt Instrument [Line Items]                
Debt instrument, repurchased face amount   381            
Stated interest rate     4.85%          
Debt at face value           600    
Notes Payable to Banks | 7% Debentures due 2029                
Debt Instrument [Line Items]                
Stated interest rate     7.00%          
Debt at face value           200    
Debt instrument, exchange amount   88            
Notes Payable to Banks | 6.95% Notes due 2029                
Debt Instrument [Line Items]                
Stated interest rate     6.95%          
Debt at face value           1,549    
Debt instrument, exchange amount   354            
Notes Payable to Banks | 7.4% Notes due 2031                
Debt Instrument [Line Items]                
Stated interest rate     7.40%          
Debt at face value           500    
Debt instrument, exchange amount   118            
Notes Payable to Banks | 7.25% Notes due 2031                
Debt Instrument [Line Items]                
Stated interest rate     7.25%          
Debt at face value           500    
Debt instrument, exchange amount   100            
Notes Payable to Banks | 7.2% Notes due 2031                
Debt Instrument [Line Items]                
Stated interest rate     7.20%          
Debt at face value           575    
Debt instrument, exchange amount   128            
Notes Payable to Banks | 5.95% Notes due 2036                
Debt Instrument [Line Items]                
Stated interest rate     5.95%          
Debt at face value           500    
Debt instrument, exchange amount   174            
Notes Payable to Banks | 5.9% Notes due 2038                
Debt Instrument [Line Items]                
Stated interest rate     5.90%          
Debt at face value           600    
Debt instrument, exchange amount   250            
Notes Payable to Banks | 6.5% Notes due 2039                
Debt Instrument [Line Items]                
Stated interest rate     6.50%          
Debt at face value           2,750    
Debt instrument, exchange amount   1,162            
Notes Payable to Banks | 5.95% Notes due 2046                
Debt Instrument [Line Items]                
Stated interest rate     5.95%          
Debt at face value           500    
Debt instrument, exchange amount   $ 171            
Notes Payable to Banks | 3.758% Notes due 2042                
Debt Instrument [Line Items]                
Stated interest rate     3.758%          
Debt at face value     $ 785          
Notes Payable to Banks | 4.025% Notes due 2062                
Debt Instrument [Line Items]                
Stated interest rate     4.025%          
Debt at face value     $ 1,770          
Notes Payable to Banks | 2.125% Notes due 2024                
Debt Instrument [Line Items]                
Stated interest rate     2.125%          
Debt at face value         $ 900      
Notes Payable to Banks | 2.4% Notes due 2025                
Debt Instrument [Line Items]                
Stated interest rate     2.40%          
Debt at face value         900      
Notes Payable to Banks | 3.8% Notes due 2052                
Debt Instrument [Line Items]                
Stated interest rate     3.80%          
Debt at face value         $ 1,100      
Variable Rate Debt Bonds                
Debt Instrument [Line Items]                
Debt at face value     $ 283          
Floating Rate Notes | Floating rate notes due 2022 at 1.06% – 1.41% during 2022 and 1.02% –1.12% during 2021                
Debt Instrument [Line Items]                
Repayments of debt $ 500              
Floating Rate Notes | Floating rate notes due 2022 at 1.06% – 1.41% during 2022 and 1.02% –1.12% during 2021 | Maximum                
Debt Instrument [Line Items]                
Stated interest rate     1.41%         1.12%
Revolving Credit Facility                
Debt Instrument [Line Items]                
Project finance facility, maximum borrowing capacity           $ 5,500 $ 6,000  
Minimum limit of debt for cross default provision     $ 200          
Commercial paper program, amount outstanding     0         $ 0
Remaining borrowing capacity under revolving credit facility     5,500          
Commercial Paper | Conoco Phillips Commercial Paper Program                
Debt Instrument [Line Items]                
Project finance facility, maximum borrowing capacity     5,500          
Commercial paper program, amount outstanding     0         $ 0
Letter of Credit | Maximum                
Debt Instrument [Line Items]                
Line of credit facility, capacity available for specific purpose other than for trade purchases     $ 500